Rounded wireframe with big cells
First, add a UV Sphere to your scene. Now go into edit mode, make sure you are in Face select mode (press Ctrl + Tab and select Face) and press Ctrl+B. Make the resulting edges as large as desired. Now press Ctrl+I to invert the selection and then press Delete > Faces.



Now go into edit mode and select all by pressing A, and then W > Subdivide Smooth and change the subdivisions up or down as desired.



Now add a Solidify Modifier to your object to add some depth. You may also want to add a Bevel modifier while you are at it.



You should now have a nice smooth wireframe: